#include<stdio.h>
#include<string.h>
#include<unistd.h>
int main()
{
    ////c 
    //printf("hello printf\n");
    //fprintf(stdout, "hello fprintf\n");
    ////system call
    //const char* msg = "hello write\n";
    //write(1, msg, strlen(msg));

    ////fork();//???
    fprintf(stdout, "hello, fprintf stdout\n");
    fprintf(stderr, "hello, fprintf stderr\n");
    return 0;
}
